Thermal degradation of acrylonitrile–butadiene–styrene (ABS) containing flame retardants using a fluidized bed reactor: The effects of Ca-based additives on halogen removal
2012
Jung, Su-Hwa | Kim, Seon-Jin | Kim, Joo-sik
In this study, the thermal degradation of a waste fraction of acrylonitrile–butadiene–styrene containing brominated flame retardants was performed to reduce halogen content in the pyrolysis oil. Thermal degradation was completed using Ca-based additives (calcium oxide, calcium hydroxide and oyster shells) in a bench-scale pyrolysis plant equipped with a fluidized bed reactor and char separation system. Pyrolysis was carried out in a temperature range of 430–510°C. In the absence of any additive, the oil yield amounted to about 77wt.%. With the additives, the oil yield was markedly reduced to within a range of 45–64wt.%. The principle compounds in the oils were toluene, ethylbenzene, styrene, cumene, α-methylstyrene, phenol and heteroatom-containing compounds. When Ca(OH)₂ was applied, total bromine and chlorine contents in the oil decreased to 0.05 and 0.04wt.%, respectively. In addition, Ca(OH)₂ reduced the antimony content in the oil to below 0.001ppm. Most of the halogens and antimony in the feed material were present in the char obtained after pyrolysis.
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